Name three things that are matter and why

What is the number of atoms in 3.54 mol s

In a ni-cd battery, a fully charged cell is composed of nickelic hydroxide. nickel is an element that has multiple oxidation states. assume the following proportions of the states: nickel charge proportions found 0 0.17 +2 0.3 +3 0.33 +4 0.5 (a) determine the mean of the nickel charge. enter the answer to 2 decimal places.(b) determine the cumulative distribution function of nickel charge.

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?